Mortality and Immortality

The Amphibians and Dwellers possess vastly extended lifespans, contrasting with the protagonist's brief, fragile human existence, leading to reflections on the weariness of eternal life, the desire for death, and the value of a finite existence.

The disappearance of Brett and Templeton highlights the mortal danger of the experiment, while the Professor discusses the infinite future consequences of actions.

The narrator's fear of death from the chasm, the deadly forest, and lack of water underscores his mortal vulnerability in this strange environment.

The narrator's struggle for survival against the worms highlights the constant threat of death in this strange world.

The amphibian's kind are not subject to aging or decay, and they withdraw from damaged bodies, raising questions about life and death.